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Date:   Sun, 15 Sep 2019 22:14:02 +0800
From:   Aaron Lu <aaron.lu@linux.alibaba.com>
To:     Aubrey Li <aubrey.intel@gmail.com>
Cc:     Tim Chen <tim.c.chen@linux.intel.com>,
        Julien Desfossez <jdesfossez@digitalocean.com>,
        Dario Faggioli <dfaggioli@suse.com>,
        "Li, Aubrey" <aubrey.li@linux.intel.com>,
        Subhra Mazumdar <subhra.mazumdar@oracle.com>,
        Vineeth Remanan Pillai <vpillai@digitalocean.com>,
        Nishanth Aravamudan <naravamudan@digitalocean.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paul Turner <pjt@google.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>,
        Kees Cook <keescook@chromium.org>,
        Greg Kerr <kerrnel@google.com>, Phil Auld <pauld@redhat.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Mel Gorman <mgorman@techsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [RFC PATCH v3 00/16] Core scheduling v3
Message-ID: <20190915141402.GA1349@aaronlu>
References: <20190726152101.GA27884@sinkpad>
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 <eec72c2d533b7600c63de3c8001cc6ab9e915afe.camel@suse.com>
 <69cd9bca-da28-1d35-3913-1efefe0c1c22@linux.intel.com>
 <fab8eabb-1cfa-9bf6-02af-3afdff3f955d@linux.intel.com>
 <20190911140204.GA52872@aaronlu>
 <7b001860-05b4-4308-df0e-8b60037b8000@linux.intel.com>
 <20190912120400.GA16200@aaronlu>
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On Fri, Sep 13, 2019 at 07:12:52AM +0800, Aubrey Li wrote:
> On Thu, Sep 12, 2019 at 8:04 PM Aaron Lu <aaron.lu@linux.alibaba.com> wrote:
> >
> > On Wed, Sep 11, 2019 at 09:19:02AM -0700, Tim Chen wrote:
> > > On 9/11/19 7:02 AM, Aaron Lu wrote:
> > > I think Julien's result show that my patches did not do as well as
> > > your patches for fairness. Aubrey did some other testing with the same
> > > conclusion.  So I think keeping the forced idle time balanced is not
> > > enough for maintaining fairness.
> >
> > Well, I have done following tests:
> > 1 Julien's test script: https://paste.debian.net/plainh/834cf45c
> > 2 start two tagged will-it-scale/page_fault1, see how each performs;
> > 3 Aubrey's mysql test: https://github.com/aubreyli/coresched_bench.git
> >
> > They all show your patchset performs equally well...And consider what
> > the patch does, I think they are really doing the same thing in
> > different ways.
> 
> It looks like we are not on the same page, if you don't mind, can both of
> you rebase your patchset onto v5.3-rc8 and provide a public branch so I
> can fetch and test it at least by my benchmark?

I'm using the following branch as base which is v5.1.5 based:
https://github.com/digitalocean/linux-coresched coresched-v3-v5.1.5-test

And I have pushed Tim's branch to:
https://github.com/aaronlu/linux coresched-v3-v5.1.5-test-tim

Mine:
https://github.com/aaronlu/linux coresched-v3-v5.1.5-test-core_vruntime

The two branches both have two patches I have sent previouslly:
https://lore.kernel.org/lkml/20190810141556.GA73644@aaronlu/
Although it has some potential performance loss as pointed out by
Vineeth, I haven't got time to rework it yet.